SALAZAR-VALLE JO: STERNASPIS PIOTROWSKIAE SR NOV 
167 
Figure 1. Sternaspis piotrowskiae sp. nov., holotype (CAS 186700), A. Ventral view; B. Same, anterior end, frontal 
view. C. Same, ventro-eaudal shield, frontal view. D. Paratype (CAS 186736), shield, frontal view. E. Paratype (CAS 
186945), shield, frontal view. F. Paratype (CAS 187017), shield, frontal view. G. Paratype (CAS 187017), shield frontal 
view. Scale bars.-A, E: 3 mm, B: 1.6 mm, C-D: 2.2 mm, F: 3.4 mm, G: 2.9 mm. [CAS1/New2/ 186700] 
Variation: There are some variations in the ventro-eaudal shield regarding shape and pigmen¬ 
tation (Figs. ID-G). The general shape is generally stable with two variations. First, the anterior 
keels might be separated medially or they ean be fused (Fig. IE). Seeond, the posterior eorners can 
be variably developed, being wide, short projections (Figs. ID-E), or larger, better defined stmc- 
tures (Figs. IF-G) in larger specimens. The fan’s margin, however, was barely crenulated to 
smooth (Fig. IE), but because dredging could have eroded this region, these differences are not 
regarded as diagnostic. Likewise for any difference in pigmentation. The pigmentation is usually 
darker in the central shield areas, and it can be orange reddish (Figs. ID-E), or reddish brown 
(Figs. 1C, F-G), but because there are gradients in their intensity and because this differences in 
intensity do not seem to be size-related, they could depend on fine variations in the sediment chem¬ 
ical composition. 
